Phygelius - growing question

Has anyone grown red phygelius? I don't know which variety mine is, but it's gone mad and taken over half the bed smothering other plants. Just dug up lots but it's roots have gone sideways and through other plant's roots, including through my lovely eremurus. The stems tend to snap off and the roots were quite hard to dig up. I should have tried to control it earlier, but it did most of the growth when it started raining in September, was still flowering earlier this month. Anyone else have this problem? Are all varities like that? It's pretty and flowers for a long time, but I would like a better behaved one.

Thank you 4th Panda, kind of you. Managed to get here and have a box to write in! Opinion seems to be, so far, that it is invasive! Think I'll dig it up. May put a bit in a pot, as was suggested in Hello Forkers.